Rainbow Electronics MAX7425 User Manual
Page 2
MAX7418–MAX7425
5th-Order, Lowpass,
Switched-Capacitor Filters
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX7418–MAX7421
(V
DD
= +5V, filter output measured at OUT, 10k
Ω || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,
SHDN = V
DD
, f
CLK
= 2.2MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND ..............................................................-0.3V to +6V
IN, OUT, COM, OS, CLK, SHDN ................-0.3V to (V
DD
+ 0.3V)
OUT Short-Circuit Duration.......................................................1s
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
Operating Temperature Ranges
MAX74 _ _C_A ...................................................0°C to +70°C
MAX74 _ _E_A ................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
CLOCK
FILTER CHARACTERISTICS
86
110
135
±50
±75
MAX7419/MAX7420
MAX7418/MAX7421
MAX7419/MAX7420
MAX7418/MAX7421
-0.2
0
+0.2
MAX7419/MAX7420
MAX7418/MAX7421
0.001 to 30
V
IN
= 4Vp-p (Note 1)
Input Voltage Range at OS
2.0
2.5
3.0
COM Voltage Range
Maximum Capacitive Output
Load Drive
UNITS
kHz
ppm/°C
V
mV
dB
V/V
V
V
k
Ω
mVp-p
k
Ω
pF
µA
µA
kHz
µA
V
V
Clock Output Current
(Internal Oscillator Mode)
I
CLK
±40
±60
Clock Input High
V
IH
4.5
Clock Input Low
V
IL
0.5
V
CLK
= 0 or 5V
PARAMETER
SYMBOL
MIN
TYP
MAX
DC Insertion Gain with
Output Offset Removed
0
0.2
0.4
Output Offset Voltage
V
OFFSET
±4
±25
Output Voltage Range
0.25
V
DD -
0.25
Clock-to-Corner Tempco
10
Offset Voltage Gain
A
OS
1
V
COM
Corner Frequency
fc
Clock-to-Corner Ratio
f
CLK
/ f
C
100:1
2.3
2.5
2.7
V
OS
V
COM
±0.1
Input Resistance at COM
R
COM
100
140
Clock Feedthrough
5
Resistive Output Load Drive
R
L
10
1
C
L
50
500
Input Leakage Current at COM
±0.1
±10
Input Leakage Current at OS
±0.1
±10
Internal Oscillator Frequency
f
OSC
68
87
106
CONDITIONS
Output, COM unconnected
V
COM
= V
DD
/ 2
(Note 2)
V
IN
= V
COM
= V
DD
/ 2
Input, OS externally driven
OS to OUT
Input, COM externally driven
SHDN = GND, V
COM
= 0 to V
DD
V
OS
= 0 to V
DD
C
OSC
= 1000pF
(Note 3)
-78
MAX7419
MAX7418
-76
-78
MAX7421
MAX7420
dB
Total Harmonic Distortion
plus Noise
THD+N
-67
f
IN
= 2kHz,
V
IN
= 4Vp-p,
measurement
bandwidth = 80kHz
FILTER CHARACTERISTICS
CLOCK